Optimization of deep stoping scheme in Ashele Copper Mine based on modified Mathews stability graph method and FLAC^3D

With the increasing depth of mining in Ashele Copper Mine in Xinjiang, the rock mass in the deep part of the mine is becoming more and more fragmented, making it difficult to guarantee the stability of the mining field. In order to ensure safe and efficient mining of deep deposits, the structural parameters of the quarry and the stoping sequence need to be optimized based on engineering geological investigations and rock mechanics parameter tests. Uses the modified Mathews stability graph method to carry out stability analysis on the top plate and side walls of the +150 m middle section of the quarry. The results show that at a height of 50 m in the middle section and a quarry length of the thickness of the ore body, it is only necessary to control the width of the quarry to less than 12 m to ensure that the top plate and the upper plate of the quarry are always in the unsupported stability zone and to meet the requirements of safe production in the quarry. In order to determine a reasonable stoping sequence for the quarry, four different stoping sequences are simulated using FLAC^3D finite element simulation software to compare the stress, displacement and plasticity zones of the quarry under different stoping sequences. The results of the study can provide a basis for the design of the Ashele Copper Mine, and can be used as a reference for the design of similar mines in China.